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It seems you are experiencing the side effect of the oral contraceptive pill.Bloating,stomach pain,nausea,fatigue,vomitting,headache,irr
egular bleeding are some of the common side effects while on the pill.These effects are usually present for initial few months and then as the body gets adjusted to the hormonal changes they subside on their own.
If the symptoms are unbearable consider visiting a Gynaecologist for evaluation.
Take Care!